Download or read book A Study of Atmospheric Neutrino Oscillations in the MINOS Far Detector written by A. Blake and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atmospheric Neutrinos in the MINOS Far Detector written by Caius Leo Frederick Howcroft and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for Muon Neutrino to Electron Neutrino Oscillations in the MINOS Experiment written by Juan Pedro Ochoa-Ricoux and published by Springer Science & Business Media. This book was released on 2011-04-11 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The centerpiece of the thesis is the search for muon neutrino to electron neutrino oscillations which would indicate a non-zero mixing angle between the first and third neutrino generations (θ13), currently the “holy grail” of neutrino physics. The optimal extraction of the electron neutrino oscillation signal is based on the novel “library event matching” (LEM) method which Ochoa developed and implemented together with colleagues at Caltech and at Cambridge, which improves MINOS’ (Main Injector Neutrino Oscillator Search) reach for establishing an oscillation signal over any other method. LEM will now be the basis for MINOS’ final results, and will likely keep MINOS at the forefront of this field until it completes its data taking in 2011. Ochoa and his colleagues also developed the successful plan to run MINOS with a beam tuned for antineutrinos, to make a sensitive test of CPT symmetry by comparing the inter-generational mass splitting for neutrinos and antineutrinos. Ochoa’s in-depth, creative approach to the solution of a variety of complex experimental problems is an outstanding example for graduate students and longtime practitioners of experimental physics alike. Some of the most exciting results in this field to emerge in the near future may find their foundations in this thesis.

Download or read book Atmospheric Electron Neutrinos in the MINOS Far Detector written by and published by . This book was released on 2007 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutrinos produced as a result of cosmic-ray interactions in the earth's atmosphere offer a powerful probe into the nature of this three-membered family of low-mass, weakly-interacting particles. Ten years ago, the Super-Kamiokande Experiment has confirmed earlier indications that neutrinos undergo lepton-flavor oscillations during propagation, proving that they are massive contrary to the previous Standard Model assumptions. The Soudan Underground Laboratory, located in northern Minnesota, was host to the Soudan2 Experiment, which has made important contributions to atmospheric neutrino research. This same lab has more recently been host to the MINOS far detector, a neutrino detector which serves as the downstream element of an accelerator-based long-baseline neutrino-oscillation experiment. This thesis has examined 418.5 live days of atmospheric neutrino data (fiducial exposure of 4.18 kton-years) collected in the MINOS far detector prior to the activation of the NuMI neutrino beam, with a specific emphasis on the investigation of electron-type neutrino interactions. Atmospheric neutrino interaction candidates have been selected and separated into showering or track-like events. The showering sample consists of 89 observed events, while the track-like sample consists of 112 observed events. Based on the Bartol atmospheric neutrino flux model of Barr et al. plus a Monte Carlo (MC) simulation of interactions in the MINOS detector, the expected yields of showering and track-like events in the absence of neutrino oscillations are 88.0 ± 1.0 and 149.1 ± 1.0 respectively (where the uncertainties reflect only the limited MC statistics). Major systematic uncertainties, especially those associated with the flux model, are cancelled by forming a double ratio of these observed and expected yields: R{sup data}{sub trk/shw}/R{sup MC}{sub trk/shw} = 0.74{sup +0.12}{sub -01.0}(stat.) ± 0.04 (syst.) This double ratio should be equal to unity in the absence of oscillations, and the value above disfavors null oscillation with 96.0% confidence. In addition, the showering sample can be used to measure the atmospheric neutrino flux. Based on the analysis presented in this thesis, the Bartol flux should be scaled by a factor of: S{sub atm} = 1.08 ± 0.12(stat.) ± 0.08(syst.) This is larger than, but consistent with, a measurement at the same location by the Soudan2 Experiment of S{sub atm} = 0.91 ± 0.07.

Download or read book Atmospheric Neutrino Induced Muons in the MINOS Far Detector written by Aftabur Dipu Rahman and published by . This book was released on 2007 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atmospheric Electron Neutrinos in the MINOS Far Detector written by Speakman Benjamin Phillip and published by . This book was released on 2007 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atmospheric Neutrino Induced Muons in the MINOS Far Detector written by and published by . This book was released on 2007 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Main Injector Neutrino Oscillation Search (MINOS) is a long baseline neutrino oscillation experiment. The MINOS Far Detector, located in the Soudan Underground Laboratory in Soudan MN, has been collecting data since August 2003. The scope of this dissertation involves identifying the atmospheric neutrino induced muons that are created by the neutrinos interacting with the rock surrounding the detector cavern, performing a neutrino oscillation search by measuring the oscillation parameter values of [Delta]m$2\atop{23}$ and sin2 2[theta]23, and searching for CPT violation by measuring the charge ratio for the atmospheric neutrino induced muons. A series of selection cuts are applied to the data set in order to extract the neutrino induced muons. As a result, a total of 148 candidate events are selected. The oscillation search is performed by measuring the low to high muon momentum ratio in the data sample and comparing it to the same ratio in the Monte Carlo simulation in the absence of neutrino oscillation. The measured double ratios for the ''all events'' (A) and high resolution (HR) samples are RA = R$data\atop{low/high}$/R$MC\atop{low/high}$ = 0.60$+0.11\atop{-0.10}$(stat) ± 0.08(syst) and RHR = R$data\atop{low/high}$/R$MC\atop{low/high}$ = 0.58$+0.14\atop{-0.11}$(stat) ± 0.05(syst), respectively. Both event samples show a significant deviation from unity giving a strong indication of neutrino oscillation. A combined momentum and zenith angle oscillation fit is performed using the method of maximum log-likelihood with a grid search in the parameter space of [Delta]m2 and sin2 2[theta]. The best fit point for both event samples occurs at [Delta]m$2\atop{23}$ = 1.3 x 10-3 eV2, and sin2 2[theta]23 = 1. This result is compatible with previous measurements from the Super Kamiokande experiment and Soudan 2 experiments. The MINOS Far Detector is the first underground neutrino detector to be able to distinguish the charge of the muons. The measured charge is used to test the rate of the neutrino to the anti-neutrino oscillations by measuring the neutrino induced muon charge ratio. Using the high resolution sample, the [mu]+ to [mu]- double charge ratio has been determined to be RCPT = R$data\atop{[mu]-/[mu]+}$/R$MC\atop{[mu]-/[mu]+}$ = 0.90$+0.24\atop{-0.18}$(stat) ± 0.09(syst). With the uncertainties added in quadrature, the CPT double ratio is consistent with unity showing no indication for CPT violation.

Download or read book Experimental Studies of Neutrino Oscillations written by Takaaki Kajita and published by World Scientific Publishing Company. This book was released on 2016-01-13 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: Takaaki Kajita and Arthur McDonald have been jointly awarded the 2015 Nobel Prize in Physics "for the discovery of neutrino oscillations, which shows that neutrinos have mass". Takaaki Kajita is a Japanese physicist who is well known for neutrino experiments at the Kamiokande and the even more outsized Super-Kamiokande. This volume of collected works of Kajita on neutrino oscillations provides a good glimpse into the rise of Asian research in the frontiers of neutrino physics. Japan is now a major force in the study of the three families of neutrinos. Much remains to be done to clarify the Dirac vs. Majorana nature of the neutrino, and the cosmological implications of the neutrino. The collected works of Kajita and his Super-Kamiokande group will leave an indelible footprint in the history of big and better science. Copyright of the cover image belongs to Kamioka Observatory, ICRR (Institute for Cosmic Ray Research), The University of Tokyo.

Download or read book An Atmospheric Muon Neutrino Disappearance Measurement with the MINOS Far Detector written by Jeremy Peter Gogos and published by . This book was released on 2007 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Atmospheric Muon Neutrino Disappearance Measurement with the MINOS Far Detector written by and published by . This book was released on 2007 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is now widely accepted that the Standard Model assumption of massless neutrinos is wrong, due primarily to the observation of solar and atmospheric neutrino flavor oscillations by a small number of convincing experiments. The MINOS Far Detector, capable of observing both the outgoing lepton and associated showering products of a neutrino interaction, provides an excellent opportunity to independently search for an oscillation signature in atmospheric neutrinos. To this end, a MINOS data set from an 883 live day, 13.1 kt-yr exposure collected between July, 2003 and April, 2007 has been analyzed. 105 candidate charged current muon neutrino interactions were observed, with 120.5 ± 1.3 (statistical error only) expected in the absence of oscillation. A maximum likelihood analysis of the observed log(L/E) spectrum shows that the null oscillation hypothesis is excluded at over 96% confidence and that the best fit oscillation parameters are sin2 2[theta]23 = 0.95 -0.32 and [Delta]m$2\atop{23}$ = 0.93$+3.94\atop{ -0.44}$ x 10-3 eV2. This measurement of oscillation parameters is consistent with the best fit values from the Super-Kamiokande experiment at 68% confidence.

Download or read book A Measurement of Neutrino Oscillations with Muon Neutrinos in the MINOS Experiment written by and published by . This book was released on 2011 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental evidence has established that neutrino flavor states evolve over time. A neutrino of a particular flavor that travels some distance can be detected in a different neutrino flavor state. The Main Injector Neutrino Oscillation Search (MINOS) is a long-baseline experiment that is designed to study this phenomenon, called neutrino oscillations. MINOS is based at Fermilab near Chicago, IL, and consists of two detectors: the Near Detector located at Fermilab, and the Far Detector, which is located in an old iron mine in Soudan, MN. Both detectors are exposed to a beam of muon neutrinos from the NuMI beamline, and MINOS measures the fraction of muon neutrinos that disappear after traveling the 734 km between the two detectors. One can measure the atmospheric neutrino mass splitting and mixing angle by observing the energy-dependence of this muon neutrino disappearance. MINOS has made several prior measurements of these parameters. Here I describe recently-developed techniques used to enhance our sensitivity to the oscillation parameters, and I present the results obtained when they are applied to a dataset that is twice as large as has been previously analyzed. We measure the mass splitting ?m232 = (2.32-0.08+0.12) x 10-3 eV2/c4 and the mixing angle sin2(2?32) > 0.90 at 90% C.L. These results comprise the world's best measurement of the atmospheric neutrino mass splitting. Alternative disappearance models are also tested. The neutrino decay hypothesis is disfavored at 7.2? and the neutrino quantum decoherence hypothesis is disfavored at 9.0?.

Download or read book Study of Neutrino Interactions in MINOS written by and published by . This book was released on 2014 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: MINOS stands for Main Injector Neutrino Oscillation Search. It is a long baseline experiment located in the USA and is composed of two detectors. The Near Detector is at Fermilab, 1 km from the source of neutrinos. The Far Detector is in Minnesota at a distance of 735 km from the source. Both detectors are steel scintillator tracking calorimeters. MINOS searches for neutrino oscillations by comparing the neutrino energy spectrum at the Far Detector with that obtained from a prediction based on the spectrum at the Near Detector. The primary aim of MINOS is to measure the atmospheric oscillation parameters [Delta]m2 32 and [theta]23. CPT symmetry requires that these parameters should be same for neutrinos and antineutrinos. Di erences between neutrino and antineutrino oscillations would be an indication of new physics beyond the neutrino-Standard Model (SM). Additionally, violation of Lorentz or CPT symmetry could also give rise to oscillations di erent from that expected from the SM predictions, such as neutrino to antineutrino transitions.

Download or read book Status of the MINOS Experiment written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on the status of the MINOS long baseline neutrino experiment presently under construction at the Fermi National Accelerator Laboratory and the Soudan mine. There is growing evidence that the solar neutrino and atmospheric neutrino anomalies [1] are the result of neutrino oscillations. The MINOS experiment is a long baseline neutrino oscillation experiment designed to study the region of parameter space indicated by the SuperKamiokande atmospheric neutrino results [2]. The experiment consists of two detectors, one with a mass of 980 tons located at Fermilab (the near detector) and the other of mass 5400 tons located 731 km away in the Soudan mine in northern Minnesota (the far detector). The third component is the neutrino beam which is currently under construction at Fermilab.

Download or read book Studies of Nu mu to Nu e Oscillation Appearance in the MINOS Experiment written by Alexandre Bruno Pereira e Sousa and published by . This book was released on 2005 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MINOS experiment uses a long baseline neutrino beam, measured 1 km downstream from its origin in the Near Detector at Fermilab, and 734 km later in the large underground Far Detector in the Soudan mine. By comparing these two measurements, MINOS can probe the atmospheric domain of the neutrino oscillation phenomenology with unprecedented precision. Besides the ability to perform a world leading determination of the {Delta}m{sub 23}{sup 2} and {theta}{sub 23} parameters, via {nu}{sub {mu}} flux disappearance, MINOS has the potential to make a leading measurement of {nu}{sub {mu}} {yields} {nu}{sub e} oscillations in the atmospheric sector by looking for {nu}{sub e} appearance at the Far Detector. The observation of {nu}{sub e} appearance, tantamount to establishing a non-zero value of the {theta}{sub 13} mixing angle, opens the way to studies of CP violation in the leptonic sector, the neutrino spectral mass pattern ordering and neutrino oscillations in matter, the driving motivations of the next generation of neutrino experiments. In this thesis, we study the MINOS potential for measuring {theta}{sub 13} in the context of the MINOS Mock Data Challenge using a multivariate discriminant analysis method. We show the method's validity in the application to {nu}{sub e} event classification and background identification, as well as in its ability to identify a {nu}{sub e} signal in a Mock Data sample generated with undisclosed parameters. An independent shower reconstruction method based on three-dimensional hit matching and clustering was developed, providing several useful discriminator variables used in the multivariate analysis method. We also demonstrate that within 2 years of running, MINOS has the potential to improve the current best limit on {theta}{sub 13}, from the CHOOZ experiment, by a factor of 2.

Download or read book Studies of Nu mu to Nu e Oscillation Appearance in the MINOS Experiment written by and published by . This book was released on 2006 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MINOS experiment uses a long baseline neutrino beam, measured 1 km downstream from its origin in the Near Detector at Fermilab, and 734 km later in the large underground Far Detector in the Soudan mine. By comparing these two measurements, MINOS can probe the atmospheric domain of the neutrino oscillation phenomenology with unprecedented precision. Besides the ability to perform a world leading determination of the [Delta]m$2\atop{23}$ and [theta]23 parameters, via v[mu] flux disappearance, MINOS has the potential to make a leading measurement of v[mu] → ve oscillations in the atmospheric sector by looking for ve appearance at the Far Detector. The observation of ve appearance, tantamount to establishing a non-zero value of the [theta]13 mixing angle, opens the way to studies of CP violation in the leptonic sector, the neutrino spectral mass pattern ordering and neutrino oscillations in matter, the driving motivations of the next generation of neutrino experiments. In this thesis, we study the MINOS potential for measuring [theta]13 in the context of the MINOS Mock Data Challenge using a multivariate discriminant analysis method. We show the method's validity in the application to ve event classification and background identification, as well as in its ability to identify a ve signal in a Mock Data sample generated with undisclosed parameters. An independent shower reconstruction method based on three-dimensional hit matching and clustering was developed, providing several useful discriminator variables used in the multivariate analysis method. We also demonstrate that within 2 years of running, MINOS has the potential to improve the current best limit on [theta]13, from the CHOOZ experiment, by a factor of 2.

Download or read book Preliminary Measurement of Neutrino Oscillation Parameters by NuMI MINOS and Calibration Studies for Improving this Measurement written by Philip Andrew Symes and published by . This book was released on 2006 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Fifth International Workshop on Neutrino Oscillations and Their Origin written by Yoichiro Suzuki and published by World Scientific Publishing Company Incorporated. This book was released on 2005 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar neutrino measurement in super-Kamiokande / Y. Koshio -- Calibration and results from the SNO salt phase / K. Graham -- KamLAND (contribution was not received) / S. Freedman -- Solar neutrino road map / C. Peña Garay -- Uncertainties in solar-neutrino source reactions : theoretical study of S[symbol] by using inverse [symbol]B reactions / M. Kamimura -- Helioseismology and neutrino physics / H. Shibahashi -- Future solar neutrino experiments / M. Nakahata -- Lens-Sol : a detector for measuring the neutrino luminosity of the sun / H. Back ... [et al.] -- SK atmospheric neutrino / C. Saji -- Direct oscillatory evidence from L/E analysis in super-Kamiokande / M. Ishitsuka -- Future atmospheric neutrino experiments : the case of water Cherenkov detectors / T. Kajita ... [et al.] -- Precise measurement of cosmic-ray proton spectrum up to 500 GEV / S. Haino -- Atmospheric cosmic-ray muons, protons, and antiprotons / T. Sanuki -- Atmospheric neutrinos and the v mass matrix / P. Lipari -- Recent K2K results / T. Ishii -- Status of global analysis of neutrino oscillation data / M. C. Gonzalez-Garcia & M. Maltoni -- Neutrino-nucleus cross sections : measurements versus calculations / P. Vogel -- Neutrino interactions at K2K / Y. Hayato -- Miniboone status / J. L. Raaf -- J-PARC neutrino beam line / T. Kobayashi -- Physics at J-Parc neutrino experiment / Y. Itow -- The status of MINOS / D. A. Petyt -- The NOvA detector measuring [symbol] with the NuMI beam / R. Rusack -- Plans for a fermilab proton driver / D. Finley -- Status of OPERA / M. Komatsu -- Summary of model precitions for U[symbol] / A. S. Joshipura -- Double-CHOOZ : a search for [symbol] / T. Lasserre -- Towards a precision measurement of [symbol] with reactor neutrinos : initiatives in the United States / K. M. Heeger -- Towards exploring U[symbol] / O. Yasuda -- On the atmospheric neutrino oscillations, [symbol] and neutrino mass hierarchy / S. T. Petcov & S. Palomares-Ruiz -- Status of KASKA : the Japanese reactor [symbol] project / F. Suekane -- Current status and future prospects of neutrino direct mass / C. Kraus -- Five sample proposals for next generation neutrinoless double-beta decay experiments / F. T. Avignone III & G. S. King III -- CANDLES for the study of [symbol] decay of [symbol]Ca / I. Ogawa ... [et al.] -- Status of the NEMO 3 experiment / F. Piquemal & L. Simard -- New CUORICINO results and the CUORE project / O. Cremonesi ... [et al.] -- EXO : a status report / K. Wamba -- Neutrinoless double beta decay, neutrino mass spectrum and CP-violation / S. Pascoli & S. T. Petcov -- Neutrinos and the deaths of massive stars / W. R. Hix, A. Mezzacappa & O. E. B. Messer -- Supernova neutrino oscillation with/without neutrino magnetic moment / S. Ando & K. Sato -- The supernova relic neutrino background / M. Kaplinghat -- Future detection of supernovas / M. R. Vagins -- Neutrinos from protoneutron stars with various equation of states / H. Suzuki -- Discovering Tau and muon solar neutrino flares above backgrounds / D. Fargion & F. Moscato -- Leptogenesis and low energy data / K. R. S. Balaji -- WIMP-nucleus scattering / G. Prézeau -- WIMPS : direct and indirect detection, status and perspectives / G. Gerbier -- DAMA/NaI results / R. Bernabei ... [et al.] -- XMASS / T. Namba -- Dark matter search with direction sensitive scintillator / H. Sekiya ... [et al.] -- Neutrino oscillations, and the origin of pulsar velocities and dark matter / A. Kusenko -- Recent topics of particle cosmology / M. Kawasaki -- B-L genesis : generalities and impact on neutrino physics / M. Yoshimura -- Models of maximal atmospheric neutrino mixing and leptogenesis / W. Grimus & L. Lavoura -- Texture zeros and CP-violating phases in the neutrino mass matrix / Z.-Z. Xing -- The MEG experiment study of the origin of Mv by searching for lepton flavor violation in charged leptons / T. Mori -- Neutrino mixing pattern and its implications for charged lepton rare decays and CP violation (contribution was not received) / K. S. Babu -- B physics, Hg EDM, and lepton flavor violation in SUSY models / Y. Shimizu -- Neutrino oscillations and their origin (NOON2004) : summary / A. Yu Smirnov